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CVE-2026-49108 – PHP Object Injection – Moderno WordPress Theme < 1.43

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Summary

CVE-2026-49108 is a critical PHP Object Injection vulnerability affecting the Moderno WordPress WooCommerce theme (all versions prior to 1.43) by vendor park_of_ideas. The flaw stems from improper deserialization of untrusted data (CWE-502) and can be exploited by unauthenticated remote attackers over the network with no user interaction required, earning a CVSS v3.1 score of 9.8 (Critical). When a suitable PHP Object Injection POP chain is present within the WordPress environment, successful exploitation can lead to remote code execution, SQL injection, path traversal, and denial of service.

Technical details

  • Root cause: Improper handling of PHP object serialization — the theme deserializes attacker-supplied data without adequate validation or sanitization (CWE-502: Deserialization of Untrusted Data).
  • Trigger conditions: No authentication or user interaction is required; the vulnerability is reachable directly over the network from an unauthenticated attacker.
  • Attack vector: Network-based (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N).
  • Impact: Exploitation potential depends on the presence of a POP (Property-Oriented Programming) gadget chain within WordPress core, the theme, or co-installed plugins. When such a chain is available, attackers can achieve remote code execution, SQL injection, path traversal, denial of service, and more — resulting in full compromise of confidentiality, integrity, and availability.

Affected software

  • Moderno WordPress WooCommerce Theme by park_of_ideas — all versions prior to 1.43

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Update the Moderno theme to version 1.43 or later via the ThemeForest update channel or the WordPress theme management dashboard.
  • If immediate patching is not feasible: Restrict external HTTP/HTTPS access to affected WordPress installations at the network perimeter or via a Web Application Firewall (WAF) until the theme can be updated.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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